The constant complex module of viscoelastic material is used to calculate the frequency and loss factor of the sandwich pate by the complexeigenvalue method.
粘弹性采用常复数模型，用求解复特征值的方法求得了其固有频率和损耗因子。
2
This paper analyses the sound decay in an acoustically treated rectangular space from the view point of wave acoustics. and a new method of calculating complexeigenvalue is given.
本文从波动声学观点出发，分析了矩形水池中声能的衰变，给出了一种解算复本征值的新方法。
3
The presented method selects only one cyclic symmetric sector of the structure as the finite element calculating model and establishes the complex constrained eigenvalue equation of the sector.